REST API 401 Unauthorized in user register JSON post

I created a headless application using Drupal and Vue.js/Nuxt.js. I want anonymous users to register and Admin approves their subscription (the configuration for this is done).

I can't find a way to understand why. When I give the Access POST on User registration resource permission to anonymous users, I get a 401 Unauthorized status with the No authentication credentials provided. message using Postman or Axios. When I give the Administer users permission to anonymous users, the POST method works fine for me without the X-CSRF-Token in the header.

The anonymous users don't need any identification methods to access the registration form and send their information using /user/register?_format=hal_json. The Administer users permission will let any user display, edit, delete users using the server URL.

let userData = {
        "_links": {
          "type": {
            "href": "http://example.com/rest/type/user/user"
          }
        },
        "name": [{"value": "jack"}],
        "mail": [{"value": "[email protected]"}],
        "field_phone": [{"value": "99999999"}],
        "roles": [{"target_id": "member"}],
        //"pass": [{"value": "0000"}] // if required email verification (admin/config/people/accounts) not checked we send pass
      };

 // Post Data
      this.$axios.post("http://example.com/user/register?_format=hal_json", userData, {
        headers: {
          "Content-type": "application/hal+json"
        }
      }).then(() => {
      }).catch(function (res) {
      });

I also tried to remove the Administer users permission from anonymous users and add the X-CSRF-Token header with a value from www.example.com/session/token, but I still get the No authentication credentials provided. message.